Resideo GS250 Thermometer

The Resideo GS250 Thermometer is a heavy-duty industrial temperature gauge designed for accurate monitoring in hydronic heating and cooling systems. Engineered as the direct replacement for the legacy 4004/53 series, this analog thermometer features a sweat brass well to ensure a secure, leak-proof installation while providing excellent thermal conductivity. The dual-scale dial displays temperature in both Fahrenheit and Celsius, allowing technicians to verify system performance against specified design parameters. With a rugged stainless steel casing and a clear, high-contrast face, the GS250 is built for long-term durability in high-vibration mechanical rooms. Its bimetallic sensing element provides a rapid response to temperature fluctuations, ensuring precise readings for balancing and diagnostics. Whether you are retrofitting an older boiler or installing a new manifold, the GS250 temperature gauge provides the mechanical reliability required for professional-grade HVACR applications.

Key Benefits

• Direct Replacement: Designed as the drop-in substitute for the discontinued 4004/53 thermometer models.
• Integrated Sweat Well: Includes a high-quality brass thermowell for permanent installation and easy sensor removal without draining the system.
• High Temperature Range: Suited for standard hydronic heating loops with a wide operating range for hot water systems.
• Mechanical Calibration: Reliable bimetal coil technology eliminates the need for external power or batteries.
• Corrosion Resistance: Brass and stainless steel construction resists scaling and oxidation in high-moisture environments.

Common Questions

Is the Resideo GS250 compatible with older Honeywell systems?
Yes, the GS250 is the manufacturer-specified replacement for the Honeywell 4004/53 series, maintaining the same form factor and accuracy standards.

What is the connection type for the brass well?
This model utilizes a sweat connection for the well, which requires proper brazing or soldering techniques to ensure a watertight seal within the piping system.

Can this thermometer be used for steam applications?
The Resideo GS250 is optimized for liquid-filled hydronic systems; always verify the maximum pressure and temperature ratings against your specific steam system requirements before installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.